Feeding pencil
A feeding pencil includes a main body, a leading tube, a middle tube, and a ratchet mechanism. The middle tube is engaged to the leading tube to be relatively rotatable. A relative rotation between the leading tube and the main body in one direction moves a drawing material forward. The ratchet mechanism allows the relative rotation between the leading tube and the main body in the one direction, and regulates the relative rotation in another direction. The ratchet mechanism includes an elastic projecting part and a concave-convex part. The concave-convex part engages with the elastic projecting part to be movable in an axial direction and rotatable. A protrusion disposed at a center tube removably engages with an annular convex part disposed at an outer surface of the leading tube in the axial direction.
1. A feeding pencil comprising:
a tubular main body;
a leading tube configured to be rotatably engaged with the main body;
a middle tube having a tube portion configured to be inserted into a rear side portion of the leading tube, the middle tube being positioned between the leading tube and the main body, the middle tube being configured to be rotatably engaged with the leading tube, the relative rotation between the leading tube and the main body in one direction moving a drawing material forward inside of the leading tube; and
a ratchet mechanism configured to allow the relative rotation between the leading tube and the main body in one direction, the ratchet mechanism being configured to regulate the relative rotation in other direction opposite from the one direction, wherein:
the ratchet mechanism includes an elastic projecting part and a concave-convex part, the elastic projecting part projecting from an outer surface on the tube portion, the elastic projecting part having elasticity in a radial direction, the concave-convex part being disposed on an inner surface of the leading tube, the concave-convex part being configured to engage with the elastic projecting part to be movable in an axial direction and rotatable, and
a projection disposed at any one of the outer surface of the tube portion and the inner surface of the leading tube is configured to removably engage with an annular convex part disposed at another in the axial direction.
2. The feeding pencil according to claim 1 , wherein:
the plurality of drawing materials are stored in the leading tube,
a plurality of sliding parts coupled to the plurality of drawing materials respectively are disposed, the plurality of sliding parts being slidable with respect to the main body by a predetermined amount, and
one arbitrary sliding part, out of the plurality of sliding parts, moves forward by a predetermined amount with respect to the main body, whereby the drawing material coupled with the one arbitrary sliding part is exposed from the leading tube, and in this state, the leading tube and the main body are relatively rotated in one direction, which allows the drawing material to move forward.